Is there that much of a difference between the Eisenmann 550 exhaust and the M5 model? If there isn't then just see if you can order the M5 mufflers or the M5 system if you're going to use the M5 diffuser.
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RIP: 2015 Black Sapphire Metallic 650i Gran Coupe, 343 Wheels, Michelin Pilot Super Sports 255 F / 285 R, M6 Front Grilles. Coming - M6 Comp. Mufflers, Carbon Fiber Diffuser & Spoiler.
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